#ifndef __APUE_H
#define _POSIX_C_SOURCE 200809L 
#define __APUE_H
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stddef.h>

#define MAXLINE 4096    /* max line length */

#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) /* default file access permissions for new file */
#define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH) /* default permissions for new directory */

typedef void Sigfunc(int);  /* for signal handles */

/* 4.3BSD Reno <signal.h> doesn't define SIG_ERR */
#if defined(SIG_IGN) && !defined(SIG_ERR)
#define SIG_ERR ((Sigfunc *)-1)
#endif

#define min(a,b) ((a) < (b) ? (a) : (b))
#define max(a,b) ((a) > (b) ? (a) : (b))


/** prototypes for our own functions */
char *path_alloc(size_t *);    /* Program 2.2 */
int open_max(void);        /* Program 2.3 */
void clr_fl(int, int);      /* Program 3.5 */
void set_fl(int, int);      /* Program 3.5 */
void set_cloexec(int);
void pr_exit(int);          /* Program 8.3 */
void pr_mask(const char *); /* Program 10.10 */
Sigfunc *signal_intr(int, Sigfunc *);   /* Program 10.13 */

int tty_cbreak(int);    /* Program 11.10 */
int tty_raw(int);       /* Program 11.10 */
int tty_reset(int);     /* Program 11.10 */
void tty_atexit(void);  /* Program 10.13 */

#ifdef ECHO    /* only if <termios.h> has been included */
struct termios *tty_termios(void);  /* Program 11.10 */
#endif

void sleep_us(struct timeval *);    /* Exercise 12.6 */
ssize_t readn(int, void *, size_t);     /* Program 12.13 */
ssize_t writen(int, const void *, size_t);  /* Program 12.12 */
int daemon_init(void);      /* Program 13.1 */

int s_pipe(int *);  /* Program 15.2 and 15.3 */
int recv_fd(int, ssize_t (*func)(int, const void *, size_t));   /* Program 15.6 and 15.8 */
int send_fd(int, int);  /* Program 15.5 and 15.7 */
int send_err(int, int, const char *); /* Program 15.4 */
int serv_listen(const char *);  /* Program 15.19 and 15.22 */
int serv_accept(int, uid_t *);  /* Program 15.20 and 15.24 */
int cli_conn(const char *);     /* Program 15.21 and 15.23 */
int buf_args(char *, int (*func)(int, char **));    /* Program 15.17 */

int ptym_open(char *);  /* Program 19.1 and 19.2 */
int ptys_open(int, char *); /* Program 19.1 and 19.2 */

#ifdef TIOCGWINSZ
pid_t pty_fork(int *, char *, const struct temios *, const struct winsize *);   /* Program 19.3 */
#endif

int lock_reg(int, int, int, off_t, int, off_t); /* Program 19.3 */

#define read_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLK, F_RDLCK, (offset), (whence), (len))

#define readw_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLKW, F_RDLCK, (offset), (whence), (len))

#define write_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLK, F_WRLCK, (offset), (whence), (len))

#define writew_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLKW, F_WRLCK, (offset), (whence), (len))

#define un_lock(fd, offset, whence, len) \
    lock_reg((fd), F_SETLK, F_UNLCK, (offset), (whence), (len))

#define lockfile(fd) write_lock((fd), 0, SEEK_SET, 0)

pid_t lock_test(int, int, off_t, int, off_t);   /* Program 12.3 */

#define is_read_lockable(fd, offset, whence, len) \
            (lock_test((fd), F_FDLCK, (offset), (whence), (len)) == 0)

#define is_writelock(fd, offset, whence, len) \
            (lock_test((fd), F_WRLCK, (offset), whence, len) == 0)

void err_dump(const char *, ...);
void err_msg(const char *, ...);
void err_quit(const char *, ...);
void err_ret(const char *, ...);
void err_sys(const char *, ...);
void err_exit(int error, const char *fmt, ...) __attribute__((noreturn));
void err_cont(int, const char *, ...);

void log_msg(const char *, ...);
void log_open(const char *, int, int);
void log_quit(const char *, ...);

void TELL_WAIT(void);   /* parent/child from Section 8.8 */
void TELL_PARENT(pid_t);
void TELL_CHILD(pid_t);
void WAIT_PARENT(void);
void WAIT_CHILD(void);

void daemonize(const char *cmd);

#endif 
